<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
  <style type="text/css">
    body,
    html {
      width: 100%;
      height: 100%;
      margin: 0;
      font-family: "微软雅黑";
    }

    #allmap {
      height: 500px;
      width: 100%;
    }

    #r-result {
      width: 100%;
      font-size: 14px;
    }
  </style>
  <script type="text/javascript" src=" http://api.map.baidu.com/getscript?v=2.0&ak=6Ej99wrRa8eXjAYpP2Auh3eg&services=&t=20170517145936"></script>
  <title>城市名定位</title>
</head>

<body>
  <div id="allmap"></div>
  <div id="r-result">
    经度: <input id="longitude" type="text" style="width:100px; margin-right:10px;" /> 纬度: <input id="latitude" type="text" style="width:100px; margin-right:10px;" />
    <input type="button" value="查询" onclick="theLocation()" />
  </div>
</body>

</html>
<script type="text/javascript">
  // 百度地图API功能
  var map = new BMap.Map("allmap");
  map.centerAndZoom(new BMap.Point(116.331398, 39.897445), 11);
  map.enableScrollWheelZoom(true);

  // 用经纬度设置地图中心点
  function theLocation() {
    if (document.getElementById("longitude").value != "" && document.getElementById("latitude").value != "") {
      map.clearOverlays();
      var new_point = new BMap.Point(document.getElementById("longitude").value, document.getElementById("latitude").value);
      var marker = new BMap.Marker(new_point); // 创建标注
      map.addOverlay(marker); // 将标注添加到地图中
      map.panTo(new_point);
    }
  }
</script>
